Detailed Description

crossover primal heuristic

Author: Timo Berthold

#include "blockmemshell/memory.h"
#include "scip/heur_crossover.h"
#include "scip/heuristics.h"
#include "scip/pub_event.h"
#include "scip/pub_heur.h"
#include "scip/pub_message.h"
#include "scip/pub_misc.h"
#include "scip/pub_sol.h"
#include "scip/pub_var.h"
#include "scip/scip_branch.h"
#include "scip/scip_cons.h"
#include "scip/scip_copy.h"
#include "scip/scip_event.h"
#include "scip/scip_general.h"
#include "scip/scip_heur.h"
#include "scip/scip_mem.h"
#include "scip/scip_message.h"
#include "scip/scip_nodesel.h"
#include "scip/scip_numerics.h"
#include "scip/scip_param.h"
#include "scip/scip_prob.h"
#include "scip/scip_randnumgen.h"
#include "scip/scip_sol.h"
#include "scip/scip_solve.h"
#include "scip/scip_solvingstats.h"
#include "scip/scip_tree.h"
#include "scip/scip_var.h"
#include <string.h>

Go to the source code of this file.

Macros
#define	HEUR_NAME "crossover"

#define	HEUR_DESC "LNS heuristic that fixes all variables that are identic in a couple of solutions"

#define	HEUR_DISPCHAR 'C'

#define	HEUR_PRIORITY -1104000

#define	HEUR_FREQ 30

#define	HEUR_FREQOFS 0

#define	HEUR_MAXDEPTH -1

#define	HEUR_TIMING SCIP_HEURTIMING_AFTERNODE

#define	HEUR_USESSUBSCIP TRUE

#define	DEFAULT_MAXNODES 5000LL /* maximum number of nodes to regard in the subproblem */

#define	DEFAULT_MINIMPROVE 0.01 /* factor by which Crossover should at least improve the incumbent */

#define	DEFAULT_MINNODES 50LL /* minimum number of nodes to regard in the subproblem */

#define	DEFAULT_MINFIXINGRATE 0.666 /* minimum percentage of integer variables that have to be fixed */

#define	DEFAULT_NODESOFS 500LL /* number of nodes added to the contingent of the total nodes */

#define	DEFAULT_NODESQUOT 0.1 /* subproblem nodes in relation to nodes of the original problem */

#define	DEFAULT_LPLIMFAC 2.0 /* factor by which the limit on the number of LP depends on the node limit */

#define	DEFAULT_NUSEDSOLS 3 /* number of solutions that will be taken into account */

#define	DEFAULT_NWAITINGNODES 200LL /* number of nodes without incumbent change heuristic should wait */

#define	DEFAULT_RANDOMIZATION TRUE /* should the choice which sols to take be randomized? */

#define	DEFAULT_DONTWAITATROOT FALSE /* should the nwaitingnodes parameter be ignored at the root node? */

#define	DEFAULT_USELPROWS

#define	DEFAULT_COPYCUTS

#define	DEFAULT_PERMUTE FALSE /* should the subproblem be permuted to increase diversification? */

#define	HASHSIZE_SOLS 500 /* size of hash table for solution tuples in crossover heuristic */

#define	DEFAULT_BESTSOLLIMIT -1 /* limit on number of improving incumbent solutions in sub-CIP */

#define	DEFAULT_USEUCT FALSE /* should uct node selection be used at the beginning of the search? */

#define	DEFAULT_RANDSEED 7 /* initial random seed */

#define	EVENTHDLR_NAME "Crossover"

#define	EVENTHDLR_DESC "LP event handler for " HEUR_NAME " heuristic"

Typedefs
typedef struct SolTuple	SOLTUPLE

Functions
static	SCIP_DECL_HASHGETKEY (hashGetKeySols)

static	SCIP_DECL_HASHKEYEQ (hashKeyEqSols)

static	SCIP_DECL_HASHKEYVAL (hashKeyValSols)

static unsigned int	calculateHashKey (int *indices, int size)

static void	sortArray (int *a, int size)

static SCIP_RETCODE	createSolTuple (SCIP scip, SOLTUPLE elem, int indices, int size, SCIP_HEURDATA *heurdata)

static SCIP_Bool	solHasNewSource (SCIP_SOL *sols, int selection, int selectionsize, int newsol)

static SCIP_RETCODE	selectSolsRandomized (SCIP scip, int selection, SCIP_HEURDATA heurdata, SCIP_Bool success)

static SCIP_RETCODE	fixVariables (SCIP scip, SCIP_VAR fixedvars, SCIP_Real fixedvals, int nfixedvars, int fixedvarssize, int selection, SCIP_HEURDATA heurdata, SCIP_Bool success)

static SCIP_RETCODE	determineVariableFixings (SCIP scip, SCIP_VAR fixedvars, SCIP_Real fixedvals, int nfixedvars, int fixedvarssize, int selection, SCIP_HEURDATA heurdata, SCIP_Bool success)

static SCIP_RETCODE	createNewSol (SCIP scip, SCIP subscip, SCIP_VAR *subvars, SCIP_HEUR heur, SCIP_SOL subsol, int solindex, SCIP_Bool *success)

static void	updateFailureStatistic (SCIP scip, SCIP_HEURDATA heurdata)

static	SCIP_DECL_EVENTEXEC (eventExecCrossover)

static	SCIP_DECL_HEURCOPY (heurCopyCrossover)

static SCIP_RETCODE	setupAndSolveSubscipCrossover (SCIP scip, SCIP subscip, SCIP_HEUR heur, SCIP_HEURDATA heurdata, SCIP_VAR vars, SCIP_VAR fixedvars, SCIP_Real fixedvals, SCIP_Longint nstallnodes, SCIP_RESULT result, int *selection, int nvars, int nfixedvars, int nusedsols)

static	SCIP_DECL_HEURFREE (heurFreeCrossover)

static	SCIP_DECL_HEURINIT (heurInitCrossover)

static	SCIP_DECL_HEUREXIT (heurExitCrossover)

static	SCIP_DECL_HEUREXEC (heurExecCrossover)

SCIP_RETCODE	SCIPincludeHeurCrossover (SCIP *scip)

Macro Definition Documentation

◆ HEUR_NAME

#define HEUR_NAME "crossover"

Definition at line 52 of file heur_crossover.c.

Referenced by SCIP_DECL_HEURCOPY(), SCIPincludeHeurCrossover(), and setupAndSolveSubscipCrossover().

◆ HEUR_DESC

#define HEUR_DESC "LNS heuristic that fixes all variables that are identic in a couple of solutions"

Definition at line 53 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ HEUR_DISPCHAR

#define HEUR_DISPCHAR 'C'

Definition at line 54 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ HEUR_PRIORITY

#define HEUR_PRIORITY -1104000

Definition at line 55 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ HEUR_FREQ

#define HEUR_FREQ 30

Definition at line 56 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ HEUR_FREQOFS

#define HEUR_FREQOFS 0

Definition at line 57 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ HEUR_MAXDEPTH

#define HEUR_MAXDEPTH -1

Definition at line 58 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ HEUR_TIMING

#define HEUR_TIMING SCIP_HEURTIMING_AFTERNODE

Definition at line 59 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ HEUR_USESSUBSCIP

#define HEUR_USESSUBSCIP TRUE

does the heuristic use a secondary SCIP instance?

Definition at line 60 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ DEFAULT_MAXNODES

#define DEFAULT_MAXNODES 5000LL /* maximum number of nodes to regard in the subproblem */

Definition at line 62 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ DEFAULT_MINIMPROVE

#define DEFAULT_MINIMPROVE 0.01 /* factor by which Crossover should at least improve the incumbent */

Definition at line 63 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ DEFAULT_MINNODES

#define DEFAULT_MINNODES 50LL /* minimum number of nodes to regard in the subproblem */

Definition at line 64 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ DEFAULT_MINFIXINGRATE

#define DEFAULT_MINFIXINGRATE 0.666 /* minimum percentage of integer variables that have to be fixed */

Definition at line 65 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ DEFAULT_NODESOFS

#define DEFAULT_NODESOFS 500LL /* number of nodes added to the contingent of the total nodes */

Definition at line 66 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ DEFAULT_NODESQUOT

#define DEFAULT_NODESQUOT 0.1 /* subproblem nodes in relation to nodes of the original problem */

Definition at line 67 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ DEFAULT_LPLIMFAC

#define DEFAULT_LPLIMFAC 2.0 /* factor by which the limit on the number of LP depends on the node limit */

Definition at line 68 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ DEFAULT_NUSEDSOLS

#define DEFAULT_NUSEDSOLS 3 /* number of solutions that will be taken into account */

Definition at line 69 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ DEFAULT_NWAITINGNODES

#define DEFAULT_NWAITINGNODES 200LL /* number of nodes without incumbent change heuristic should wait */

Definition at line 70 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ DEFAULT_RANDOMIZATION

#define DEFAULT_RANDOMIZATION TRUE /* should the choice which sols to take be randomized? */

Definition at line 71 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ DEFAULT_DONTWAITATROOT

#define DEFAULT_DONTWAITATROOT FALSE /* should the nwaitingnodes parameter be ignored at the root node? */

Definition at line 72 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ DEFAULT_USELPROWS

#define DEFAULT_USELPROWS

Value:

FALSE /* should subproblem be created out of the rows in the LP rows,

* otherwise, the copy constructors of the constraints handlers are used */

FALSE

#define FALSE

Definition: def.h:72

Definition at line 73 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ DEFAULT_COPYCUTS

#define DEFAULT_COPYCUTS

Value:

TRUE           /* if DEFAULT_USELPROWS is FALSE, then should all active cuts from the
                                              * cutpool of the original scip be copied to constraints of the subscip
                                              */

Definition at line 75 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ DEFAULT_PERMUTE

#define DEFAULT_PERMUTE FALSE /* should the subproblem be permuted to increase diversification? */

Definition at line 78 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ HASHSIZE_SOLS

#define HASHSIZE_SOLS 500 /* size of hash table for solution tuples in crossover heuristic */

Definition at line 79 of file heur_crossover.c.

Referenced by SCIP_DECL_HEURINIT().

◆ DEFAULT_BESTSOLLIMIT

#define DEFAULT_BESTSOLLIMIT -1 /* limit on number of improving incumbent solutions in sub-CIP */

Definition at line 80 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ DEFAULT_USEUCT

#define DEFAULT_USEUCT FALSE /* should uct node selection be used at the beginning of the search? */

Definition at line 81 of file heur_crossover.c.

Referenced by SCIPincludeHeurCrossover().

◆ DEFAULT_RANDSEED

#define DEFAULT_RANDSEED 7 /* initial random seed */

Definition at line 82 of file heur_crossover.c.

Referenced by SCIP_DECL_HEURINIT().

◆ EVENTHDLR_NAME

#define EVENTHDLR_NAME "Crossover"

Definition at line 85 of file heur_crossover.c.

Referenced by SCIP_DECL_EVENTEXEC(), and setupAndSolveSubscipCrossover().

◆ EVENTHDLR_DESC

#define EVENTHDLR_DESC "LP event handler for " HEUR_NAME " heuristic"

Definition at line 86 of file heur_crossover.c.

Referenced by setupAndSolveSubscipCrossover().

Typedef Documentation

◆ SOLTUPLE

typedef struct SolTuple SOLTUPLE

Definition at line 92 of file heur_crossover.c.

Function Documentation

◆ SCIP_DECL_HASHGETKEY()

static SCIP_DECL_HASHGETKEY ( hashGetKeySols )

static

gets the hash key of a solution tuple

Definition at line 144 of file heur_crossover.c.

◆ SCIP_DECL_HASHKEYEQ()

static SCIP_DECL_HASHKEYEQ ( hashKeyEqSols )

static

returns TRUE iff both solution tuples are identical

Definition at line 152 of file heur_crossover.c.

References FALSE, NULL, and TRUE.

◆ SCIP_DECL_HASHKEYVAL()

static SCIP_DECL_HASHKEYVAL ( hashKeyValSols )

static

returns hashkey of a solution tuple

Definition at line 183 of file heur_crossover.c.

◆ calculateHashKey()

static unsigned int calculateHashKey	(	int *	indices,
		int	size
	)

static

calculates a hash key for a given tuple of solution indices

Parameters

indices	indices of solutions
size	number of solutions

Definition at line 191 of file heur_crossover.c.

Referenced by createSolTuple().

◆ sortArray()

static void sortArray	(	int *	a,
		int	size
	)

static

insertion sort for a small int array

Parameters

a	array to be sorted
size	size of array

Definition at line 211 of file heur_crossover.c.

Referenced by createSolTuple().

◆ createSolTuple()

static SCIP_RETCODE createSolTuple	(	SCIP *	scip,
		SOLTUPLE **	elem,
		int *	indices,
		int	size,
		SCIP_HEURDATA *	heurdata
	)

static

creates a new tuple of solutions

Parameters

scip	original SCIP data structure
elem	tuple of solutions which should be created
indices	indices of solutions
size	number of solutions
heurdata	primal heuristic data

Definition at line 237 of file heur_crossover.c.

References BMScopyMemoryArray, calculateHashKey(), SCIP_CALL, SCIP_OKAY, SCIPallocBlockMemory, SCIPallocBlockMemoryArray, and sortArray().

Referenced by determineVariableFixings(), selectSolsRandomized(), and setupAndSolveSubscipCrossover().

◆ solHasNewSource()

static SCIP_Bool solHasNewSource	(	SCIP_SOL **	sols,
		int *	selection,
		int	selectionsize,
		int	newsol
	)

static

checks whether the new solution was found at the same node by the same heuristic as an already selected one

Parameters

sols	feasible SCIP solutions
selection	pool of solutions crossover uses
selectionsize	size of solution pool
newsol	candidate solution

Definition at line 264 of file heur_crossover.c.

References FALSE, SCIPsolGetHeur(), SCIPsolGetNodenum(), and TRUE.

Referenced by selectSolsRandomized().

◆ selectSolsRandomized()

static SCIP_RETCODE selectSolsRandomized	(	SCIP *	scip,
		int *	selection,
		SCIP_HEURDATA *	heurdata,
		SCIP_Bool *	success
	)

static

randomly selects the solutions crossover will use from the pool of all solutions found so far

Parameters

scip	original SCIP data structure
selection	pool of solutions crossover uses
heurdata	primal heuristic data
success	pointer to store whether the process was successful

Definition at line 285 of file heur_crossover.c.

References createSolTuple(), FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPgetNSols(), SCIPgetSols(), SCIPhashtableExists(), SCIPhashtableInsert(), SCIPrandomGetInt(), solHasNewSource(), and TRUE.

Referenced by determineVariableFixings().

◆ fixVariables()

static SCIP_RETCODE fixVariables	(	SCIP *	scip,
		SCIP_VAR **	fixedvars,
		SCIP_Real *	fixedvals,
		int *	nfixedvars,
		int	fixedvarssize,
		int *	selection,
		SCIP_HEURDATA *	heurdata,
		SCIP_Bool *	success
	)

static

determines the fixings for the CROSSOVER subproblem and checks whether enough fixings were found

Parameters

scip	original SCIP data structure
fixedvars	array to store source SCIP variables whose copies should be fixed in the sub-SCIP
fixedvals	array to store solution values for variable fixing
nfixedvars	pointer to store the number of fixed variables
fixedvarssize	size of the arrays to store fixing variables
selection	pool of solutions crossover will use
heurdata	primal heuristic data
success	pointer to store whether the problem was created successfully

Definition at line 352 of file heur_crossover.c.

References FALSE, MAX, NULL, REALABS, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPgetSols(), SCIPgetSolVal(), SCIPgetVarsData(), SCIPvarGetLbGlobal(), SCIPvarGetUbGlobal(), and TRUE.

Referenced by determineVariableFixings().

◆ determineVariableFixings()

static SCIP_RETCODE determineVariableFixings	(	SCIP *	scip,
		SCIP_VAR **	fixedvars,
		SCIP_Real *	fixedvals,
		int *	nfixedvars,
		int	fixedvarssize,
		int *	selection,
		SCIP_HEURDATA *	heurdata,
		SCIP_Bool *	success
	)

static

creates a subproblem for subscip by fixing a number of variables

Parameters

scip	original SCIP data structure
fixedvars	array to store source SCIP variables whose copies should be fixed in the sub-SCIP
fixedvals	array to store solution values for variable fixing
nfixedvars	pointer to store the number of fixed variables
fixedvarssize	size of the arrays to store fixing variables
selection	pool of solutions crossover will use
heurdata	primal heuristic data
success	pointer to store whether the problem was created successfully

Definition at line 430 of file heur_crossover.c.

References createSolTuple(), FALSE, fixVariables(), SCIP_Bool, SCIP_CALL, SCIP_Longint, SCIP_OKAY, SCIPgetNSols(), SCIPgetSols(), SCIPhashtableExists(), SCIPhashtableInsert(), SCIPsolGetHeur(), SCIPsolGetNodenum(), selectSolsRandomized(), and TRUE.

Referenced by SCIP_DECL_HEUREXEC().

◆ createNewSol()

static SCIP_RETCODE createNewSol	(	SCIP *	scip,
		SCIP *	subscip,
		SCIP_VAR **	subvars,
		SCIP_HEUR *	heur,
		SCIP_SOL *	subsol,
		int *	solindex,
		SCIP_Bool *	success
	)

static

creates a new solution for the original problem by copying the solution of the subproblem

Parameters

scip	original SCIP data structure
subscip	SCIP structure of the subproblem
subvars	the variables of the subproblem
heur	crossover heuristic structure
subsol	solution of the subproblem
solindex	index of the solution
success	used to store whether new solution was found or not

Definition at line 513 of file heur_crossover.c.

References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPallocBufferArray, SCIPcreateSol(), SCIPfreeBufferArray, SCIPgetNOrigVars(), SCIPgetSolVals(), SCIPgetVarsData(), SCIPsetSolVals(), SCIPsolGetIndex(), SCIPtrySolFree(), and TRUE.

Referenced by setupAndSolveSubscipCrossover().

◆ updateFailureStatistic()

static void updateFailureStatistic	(	SCIP *	scip,
		SCIP_HEURDATA *	heurdata
	)

static

updates heurdata after a run of crossover

Parameters

scip	original SCIP data structure
heurdata	primal heuristic data

Definition at line 559 of file heur_crossover.c.

References SCIP_LONGINT_MAX, and SCIPgetNNodes().

Referenced by SCIP_DECL_HEUREXEC(), and setupAndSolveSubscipCrossover().

◆ SCIP_DECL_EVENTEXEC()

static SCIP_DECL_EVENTEXEC ( eventExecCrossover )

static

Definition at line 578 of file heur_crossover.c.

References EVENTHDLR_NAME, NULL, SCIP_CALL, SCIP_EVENTTYPE_LPSOLVED, SCIP_LONGINT_FORMAT, SCIP_OKAY, SCIPdebugMsg, SCIPeventGetType(), SCIPeventhdlrGetName(), SCIPgetNLPs(), and SCIPinterruptSolve().

◆ SCIP_DECL_HEURCOPY()

static SCIP_DECL_HEURCOPY ( heurCopyCrossover )

static

copy method for primal heuristic plugins (called when SCIP copies plugins)

Definition at line 607 of file heur_crossover.c.

References HEUR_NAME, NULL, SCIP_CALL, SCIP_OKAY, SCIPheurGetName(), and SCIPincludeHeurCrossover().

◆ setupAndSolveSubscipCrossover()

static SCIP_RETCODE setupAndSolveSubscipCrossover	(	SCIP *	scip,
		SCIP *	subscip,
		SCIP_HEUR *	heur,
		SCIP_HEURDATA *	heurdata,
		SCIP_VAR **	vars,
		SCIP_VAR **	fixedvars,
		SCIP_Real *	fixedvals,
		SCIP_Longint	nstallnodes,
		SCIP_RESULT *	result,
		int *	selection,
		int	nvars,
		int	nfixedvars,
		int	nusedsols
	)

static

setup and solve the subproblem and catch the return code

Parameters

scip	SCIP data structure
subscip	sub-SCIP data structure
heur	mutation heuristic
heurdata	heuristics data
vars	SCIP variables
fixedvars	array to store the variables that should be fixed in the subproblem
fixedvals	array to store the fixing values to fix variables in the subproblem
nstallnodes	node limit for the subproblem
result	pointer to store the result
selection	pool of solutions crossover uses
nvars	number of original problem's variables
nfixedvars	the number of variables that should be fixed
nusedsols	number of solutions which will be chosen

Definition at line 621 of file heur_crossover.c.

References createNewSol(), createSolTuple(), EVENTHDLR_DESC, EVENTHDLR_NAME, FALSE, HEUR_NAME, MIN, NULL, SCIP_Bool, SCIP_CALL, SCIP_CALL_ABORT, SCIP_EVENTTYPE_LPSOLVED, SCIP_FOUNDSOL, SCIP_OKAY, SCIP_PARAMSETTING_FAST, SCIP_PARAMSETTING_OFF, SCIP_PLUGINNOTFOUND, SCIP_Real, SCIPallocBufferArray, SCIPblkmem(), SCIPcatchEvent(), SCIPcopyLargeNeighborhoodSearch(), SCIPcopyLimits(), SCIPdebug, SCIPdebugMsg, SCIPdropEvent(), SCIPerrorMessage, SCIPfindBranchrule(), SCIPfindConshdlr(), SCIPfindNodesel(), SCIPfreeBufferArray, SCIPgetBestSol(), SCIPgetLowerbound(), SCIPgetNNodes(), SCIPgetNSols(), SCIPgetSols(), SCIPgetUpperbound(), SCIPhashmapCreate(), SCIPhashmapFree(), SCIPhashmapGetImage(), SCIPhashtableInsert(), SCIPheurGetNCalls(), SCIPincludeEventhdlrBasic(), SCIPinitializeRandomSeed(), SCIPisInfinity(), SCIPisParamFixed(), SCIPmergeVariableStatistics(), SCIPpermuteProb(), SCIPprintStatistics(), SCIPsetBoolParam(), SCIPsetCharParam(), SCIPsetIntParam(), SCIPsetLongintParam(), SCIPsetObjlimit(), SCIPsetPresolving(), SCIPsetSeparating(), SCIPsetSubscipsOff(), SCIPsolGetIndex(), SCIPsolve(), SCIPsumepsilon(), SCIPtransformProb(), SCIPwriteOrigProblem(), TRUE, and updateFailureStatistic().

Referenced by SCIP_DECL_HEUREXEC().

◆ SCIP_DECL_HEURFREE()

static SCIP_DECL_HEURFREE ( heurFreeCrossover )

static

destructor of primal heuristic to free user data (called when SCIP is exiting)

Definition at line 867 of file heur_crossover.c.

References NULL, SCIP_OKAY, SCIPfreeBlockMemory, SCIPheurGetData(), and SCIPheurSetData().

◆ SCIP_DECL_HEURINIT()

static SCIP_DECL_HEURINIT ( heurInitCrossover )

static

initialization method of primal heuristic (called after problem was transformed)

Definition at line 887 of file heur_crossover.c.

References DEFAULT_RANDSEED, HASHSIZE_SOLS, NULL, SCIP_CALL, SCIP_OKAY, SCIPblkmem(), SCIPcreateRandom(), SCIPhashtableCreate(), SCIPheurGetData(), and TRUE.

◆ SCIP_DECL_HEUREXIT()

static SCIP_DECL_HEUREXIT ( heurExitCrossover )

static

deinitialization method of primal heuristic (called before transformed problem is freed)

Definition at line 920 of file heur_crossover.c.

References NULL, SCIP_OKAY, SCIPfreeBlockMemory, SCIPfreeBlockMemoryArray, SCIPfreeRandom(), SCIPhashtableFree(), and SCIPheurGetData().

◆ SCIP_DECL_HEUREXEC()

static SCIP_DECL_HEUREXEC ( heurExecCrossover )

static

execution method of primal heuristic

Definition at line 955 of file heur_crossover.c.

References determineVariableFixings(), FALSE, MIN, NULL, SCIP_Bool, SCIP_CALL, SCIP_DELAYED, SCIP_DIDNOTFIND, SCIP_DIDNOTRUN, SCIP_Longint, SCIP_OKAY, SCIP_Real, SCIPallocBufferArray, SCIPcheckCopyLimits(), SCIPcreate(), SCIPfree(), SCIPfreeBufferArray, SCIPgetBestSol(), SCIPgetDepth(), SCIPgetNNodes(), SCIPgetNSols(), SCIPgetSolNodenum(), SCIPgetSols(), SCIPgetVarsData(), SCIPheurGetData(), SCIPheurGetNBestSolsFound(), SCIPheurGetNCalls(), SCIPisStopped(), setupAndSolveSubscipCrossover(), and updateFailureStatistic().

SCIP

Detailed Description

Macros

Typedefs

Functions

Macro Definition Documentation

◆ HEUR_NAME

◆ HEUR_DESC

◆ HEUR_DISPCHAR

◆ HEUR_PRIORITY

◆ HEUR_FREQ

◆ HEUR_FREQOFS

◆ HEUR_MAXDEPTH

◆ HEUR_TIMING

◆ HEUR_USESSUBSCIP

◆ DEFAULT_MAXNODES

◆ DEFAULT_MINIMPROVE

◆ DEFAULT_MINNODES

◆ DEFAULT_MINFIXINGRATE

◆ DEFAULT_NODESOFS

◆ DEFAULT_NODESQUOT

◆ DEFAULT_LPLIMFAC

◆ DEFAULT_NUSEDSOLS

◆ DEFAULT_NWAITINGNODES

◆ DEFAULT_RANDOMIZATION

◆ DEFAULT_DONTWAITATROOT

◆ DEFAULT_USELPROWS

◆ DEFAULT_COPYCUTS

◆ DEFAULT_PERMUTE

◆ HASHSIZE_SOLS

◆ DEFAULT_BESTSOLLIMIT

◆ DEFAULT_USEUCT

◆ DEFAULT_RANDSEED

◆ EVENTHDLR_NAME

◆ EVENTHDLR_DESC

Typedef Documentation

◆ SOLTUPLE

Function Documentation

◆ SCIP_DECL_HASHGETKEY()

◆ SCIP_DECL_HASHKEYEQ()

◆ SCIP_DECL_HASHKEYVAL()

◆ calculateHashKey()

◆ sortArray()

◆ createSolTuple()

◆ solHasNewSource()

◆ selectSolsRandomized()

◆ fixVariables()

◆ determineVariableFixings()

◆ createNewSol()

◆ updateFailureStatistic()

◆ SCIP_DECL_EVENTEXEC()

◆ SCIP_DECL_HEURCOPY()

◆ setupAndSolveSubscipCrossover()

◆ SCIP_DECL_HEURFREE()

◆ SCIP_DECL_HEURINIT()

◆ SCIP_DECL_HEUREXIT()

◆ SCIP_DECL_HEUREXEC()